Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 141,885	$ 138,616
Short-term investments and interest-bearing deposits	1,612,411	1,282,462
Securities available-for-sale (amortized cost of $898,463 at March 31, 2021 and $1,019,230 at December 31, 2020)	908,844	1,036,550
Loans	15,651,848	15,644,396
Less: Allowance for loan losses	(147,264)	(166,538)
Unamortized deferred loan fees, net	(6,872)	(2,494)
Loans, net	15,497,712	15,475,364
Equity securities	20,993	23,744
Federal Home Loan Bank stock	17,250	17,250
Other real estate owned, net	4,918	4,918
Affordable housing investments and alternative energy partnerships, net	296,229	309,016
Premises and equipment, net	101,864	102,998
Customers’ liability on acceptances	4,125	13,753
Accrued interest receivable	58,216	59,032
Goodwill	372,189	372,189
Other intangible assets, net	5,249	5,434
Right-of-use assets - operating leases	32,927	30,919
Other assets	155,377	170,889
Total assets	19,230,189	19,043,134
Deposits:
Non-interest-bearing demand deposits	3,495,775	3,365,086
Interest-bearing deposits:
NOW deposits	1,915,822	1,926,135
Money market deposits	3,808,794	3,359,191
Savings deposits	911,210	785,672
Time deposits	6,222,032	6,673,317
Total deposits	16,353,633	16,109,401
Advances from the Federal Home Loan Bank	75,000	150,000
Other borrowings of affordable housing investments	23,333	23,714
Long-term debt	119,136	119,136
Acceptances outstanding	4,125	13,753
Lease liabilities - operating leases	35,803	33,484
Other liabilities	155,870	175,502
Total liabilities	16,766,900	16,624,990
Commitments and contingencies	0	0
Stockholders’ Equity
Common stock, $0.01 par value, 100,000,000 shares authorized; 90,729,966 issued and 79,595,025 outstanding at March 31, 2021, and 90,643,206 issued and 79,508,265 outstanding at December 31, 2020	907	906
Additional paid-in-capital	965,566	964,734
Accumulated other comprehensive income, net	1,686	5,310
Retained earnings	1,837,261	1,789,325
Treasury stock, at cost (11,134,941 shares at March 31, 2021, and 11,134,941 shares at December 31, 2020)	(342,131)	(342,131)
Total equity	2,463,289	2,418,144
Total liabilities and equity	$ 19,230,189	$ 19,043,134